FORT WORTH, Texas (AP) -- Iowa State linebacker Jake Knottfigures at some point people will quit referring to all thesebig wins by the Cyclones as upsets.

They got another one Saturday, ending the longest winning streakin major college football at 12 games with a 37-23 victory at15th-ranked TCU.

This is the third season in a row the Cyclones (4-1, 1-1 Big 12)won on the road against a Top 25 team. And don't forget theirdouble-overtime victory at home last year over Oklahoma Statethat cost the Cowboys a shot at the BCS national championship.

"I don't think they are so much upsets anymore," said Knott, thestandout senior who had a late interception. "There's a lot ofpeople now that respect us on a new level. We need to keepwinning games like this to do that."

It was the first Big 12 home game for conference newcomer TCU(4-1, 1-1), which played without suspended quarterback CaseyPachall and had five turnovers.

Jared Barnett made his first start of the season and threw threetouchdowns to Josh Lenz, who later had a scoring toss of his ownon a trick play. David Irving, the Cyclones' 6-foot-7, 280-pounddefensive end, returned an interception 20 yards for atouchdown.

Iowa State, which is home against No. 7 Kansas State next week,won for only the third time in 33 road games against a Top 25team since 1996. All of those wins have come in the last threeyears in the state of Texas, including Barnett's first careerstart last season at Texas Tech.

"It feels great, but it doesn't mean nothing if we don't comeback and finish strong the rest of the season," said Lenz, whohad five catches for 147 yards.

Barnett was 12-of-21 passing for 183 yards and ran nine timesfor 30 yards. The touchdown throws of 51 and 74 yards in thefirst quarter put the Cyclones up 16-7, and he threw a 1-yarderto Lenz to start the second half.

The Frogs had won a nation-best 25 conference games in a row,the first 24 while winning the Mountain West championship eachof the last three seasons. They won their Big 12 debut atKansas three weeks ago, and hadn't lost a conference game sinceNov. 6, 2008 at Utah.

Dual-threat redshirt freshman Trevone Boykin took over forPachall, the second-year starter who is suspended indefinitelyafter his arrest early Thursday on suspicion of driving whileintoxicated.

Pachall wasn't on the sideline after Patterson changed hisinitial decision to have the quarterback in uniform withoutplaying.

The coach is scheduled to meet Sunday with TCU's chancellor todiscuss Pachall, who eight months before his arrest this weekadmitted to police that he smoked marijuana and failed ateam-administered drug test.

Boykin was 23 of 40 passing for 270 yards with one score. He hadthree interceptions, one on his first pass of the game beforetwo more in the fourth quarter.

Freshman B.J. Catalon had 13 carries for 86 yards, but had twofumbles - one inside the Iowa State 5. Senior running backMatthew Tucker didn't play because of a left ankle injury.

Jaden Oberkrom had field goals of 38, 50 and 39 yards for TCU,which lost for only the second time its last 30 home games.

The Cyclones trickery came late in the third quarter when aftertaking a handoff on a reverse Lenz stopped and threw a 15-yardscore to tight end Ernst Brun. That capped a 10-play drive aidedby two personal foul penalties, including a late hit by standoutend Stansly Maponga that wiped out a fourth-and-9 for IowaState.

Still, the Cyclones never trailed after the fourth play of thegame, when Barnett avoided a near turnover when he made contactwith his running back on play action before hitting Lenz instride for the touchdown.

"The play didn't start the way you wanted it do," coach PaulRhoads said. "On plays like that, focus tends to heighten alittle bit. ... He delivered a very accurate ball to end theplay. Where the ball went is where the ball was supposed to go."

Steele Jantz, the senior quarterback Barnett replaced in thelineup, had one carry for 7 yards.

Despite temperatures in the 50s, Boykin was dealing with legcramps. He stayed on the ground after rolling right and throwinga 28-yard pass to Brandon Carter early in the fourth quarter.

When Boykin returned for the next series, Irving had hisinterception after swatting the pass and grabbing it out of theair. The Frogs had the ball one more time, but Knott picked offa pass near the goal line and got to the 36 before running outof bounds into the Iowa State bench area.

"I had intentions of bringing it all the way back," Knott said."I heard the sideline say get out of bounds. I made the rightdecision."

Yep, the Cyclones had another big victory, the kind they aregetting used to having.

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